Abstract
Droplet diameter measurement near a nozzle exit of a common-rail Diesel injector using PDA
Highlights
In recent years, the fuel injection pressure in diesel engines has been increased to improve atomization, and to achieve high efficiency under high supercharging and high EGR conditions [1]
In order to understand the spray characteristics formed by the common-rail diesel injector, investigations of diesel injection sprays using several measurement techniques like laser sheet method with laser-induced fluorescence (LIF), phase Doppler anemometor (PDA) [5], particle image velocimetry (PIV) have been carried out for better control of spray and combustion characteristics [6]
Droplet diameter and axial velocity in spray formed by single hole of the common-rail injector were measured with HiDense phase Doppler anemometer (PDA) system to investigate atomization characteristics very close to the nozzle exit of the common-rail injector
Summary
The fuel injection pressure in diesel engines has been increased to improve atomization, and to achieve high efficiency under high supercharging and high EGR conditions [1]. Crua et al tried to visualize the jet break-up process of the common-rail diesel injection using ultra-high speed imaging with the long-range microscope [8] They tried to measure the droplet diameter distribution very close to the nozzle exit [9]. Droplet diameter and axial velocity in spray formed by one hole of multi-hole injector were measured with HiDense PDA system to investigate atomization characteristics near the nozzle exit of the DISI injector under 20MPa as the injection pressure [15]. The purpose of this study is to measure the droplet diameter distribution very close to the nozzle exit of a common-rail Diesel injector using a phase Doppler anemometer (PDA) In this experiment, droplet diameter and axial velocity in spray formed by single hole of the commonrail Diesel injector were measured with HiDense PDA system to investigate atomization characteristics. Radial distribution of droplet diameter and velocity were measured using HiDense PDA system in comparison with the ultra-high-speed visualization using high-speed camera
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